Ontogenic variations in fatty acid and alcohol composition of the pelagic amphipod <Emphasis Type="Italic">Themisto libellula</Emphasis> in Kongsfjorden (Svalbard) |
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Authors: | Email author" target="_blank">Margaux?NoyonEmail author Fanny?Narcy Patrick?Mayzaud |
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Institution: | 1.Laboratoire d’Océanographie de Villefranche,UPMC Univ Paris 06, UMR 7093,Villefranche-sur-mer,France;2.Laboratoire d’Océanographie de Villefranche,CNRS, UMR 7093,Villefranche-sur-mer,France;3.Department of Zoology and Entomology, Southern Ocean Group,Rhodes University,Grahamstown,South Africa;4.Department of Arctic and Marine Biology-BFE,University of Troms?,Troms?,Norway;5.Norwegian Polar Institute,Troms?,Norway |
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Abstract: | The fatty acid and alcohol composition of the pelagic amphipod, Themisto libellula, was monitored during the 5 first months of its life cycle (4–20 mm length) in an Arctic fjord, Kongsfjorden, Svalbard. Fatty
acids of the three major lipid classes, polar lipids (PL), triacylglycerol (TAG), and wax esters (WE), were analyzed to highlight
ontogenic changes in their diet and metabolism. The PL composition of T. libellula did not show any strong variations along their growth except during the first month where an important increase of 20:5(n-3)
(EPA) and 22:6(n-3) (DHA) was observed. The TAG composition revealed a clear gradient corresponding to a diet shift from omnivorous
juveniles toward carnivorous sub-adults and adults. Indeed, fatty acid trophic markers of diatoms were dominant in the juveniles,
whereas 20:1(n-9) and 22:1(n-11), the Calanus sp. trophic markers, overwhelmed in the older stages. The WE composition highlighted the same general trend, however, differences
were found with the TAG and are discussed as a result of differences in turnover rates and assimilation pathways between the
two lipid classes. |
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